Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

A vistor walks along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

A vistor walks along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Park visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Park visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

A park visitor looks at age rings on a cut section of a Coastal Redwood tree at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

A park visitor looks at age rings on a cut section of a Coastal Redwood tree at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Park visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Park visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Visitors walk along a path of Coastal Redwood trees at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Age rings are shown on a cut section of a Coastal Redwood tree at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Age rings are shown on a cut section of a Coastal Redwood tree at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood tree needles are seen at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood tree needles are seen at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood tree needles are seen at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

Coastal Redwood tree needles are seen at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

A young Coastal Redwood tree grows at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

A young Coastal Redwood tree grows at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's Coast Redwoods and Giant Sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives.

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Coastal Redwood trees stand at Muir Woods National Monument on August... News PhotoCalifornia,Environmental Issues,Horizontal,Marin County,Mill Valley,Muir Woods,Nature,Sequoia Tree,Tree,USAPhotographer Justin SullivanCollection: Getty Images News 2013 Getty ImagesMILL VALLEY, CA - AUGUST 20: Coastal Redwood trees stand at Muir Woods National Monument on August 20, 2013 in Mill Valley, California. A four-year study by the Save the Redwoods League called 'the Redwoods and Climate Change Initiative' found that due to changing environmental conditions, California's coast redwoods and giant sequoias are experiencing an unprecedented growth surge and have produced more wood over the past century than any other time in their lives. (Photo by Justin Sullivan/Getty Images)